Kumar, L., Singh, S., Pratap, D., Singh, K.K., Nayak, S., Kumar, S. and Tripathi, U. 2022. Comparison of predictive values of Mannheim peritonitis index, acute physiology and chronic health evaluation-II and Portsmouth-POSSUM scoring systems for prognosis of mortality in patients with perforation peritonitis. International Journal of Research in Medical Sciences. 10, 5 (Apr. 2022), 1059–1065. DOI:https://doi.org/10.18203/2320-6012.ijrms20221176.